9mm actually predates .45 by 1 or 2 yearsI just sold a tricked out SIG 320 VTAC..and kept a Kimber Pro covert Carry custom shop ,45 1911
Friend it is like blondes or redheads.. either is an excellent choice.
I am 72 and the weight /size for comfortable carry came down on the Kimber side..either will obliterate the x ring at 25 feet and score tens at 50 with my old eyes and slightly less than "iron" stance.
the 9 is cheaper to shoot...and is new and sparkerly the 1911 ,45 is over 100years of polished class-
Choose your weapon! STANDBY....TARGETS! satisfaction and enjoyment with either lady!